Draft gauge



Sept. 25, 1923.

L. E. JONES ET AL DRAFT GAUGE Filed March 20, 1920 2 Shuts-Sheet 1 gnownlou:

Patented Sept. 25, 1923.

mm mnswonrn Jonas AND UNITED STATES PIA-TENT orricnf CHARLES nosviotn' Warden, or Anaconna,

MONTANA.

DRAFT GAUGE,

Application filed March 20,1920. Serial No. 367,453.

To all whom it more] concern:

Be it known that we, (1) LABANELLs- WORTH Jonas and (2) CHARLES Roswo'nn VVRArrir. citizens of the United States, residing at Anaconda, in the county of Deer lodge and State of Montana, have invented tions, reference is made to each in turn.

certain new and useful Improvements in Draft Gauges, of which the following is a specification. a I

This invention relates to measuring, indicating, and recording instruments for the determination of draft pressures. I The main object of this invention, generally stated, is to provide an instrument/that Will measure, indicate, and record, accurate,

1 and i instantaneously, .draft, pressures positive or negative) through any range of draft pressure variation desired with a liberal movement of the indicating pointer or recording pen for extremely smallvaria: tions of draft pre'mure.

A further object of this invention is to provide an'instrument of such. stability as to make it comparatively non-sensitive to disturbing.conditionsforeign to the operation of the instrument, such as vibrations, weight of ink in the recording pen, friction of pen on recording chart, and the like.

A further object of thisinvention is to provide an instrument which can be regulated and calibrated to record extremely small draft ressnre variationsbetweenany desired dra t pressures or throughout a range of draft pressure from positive pressure to negative pressure.

'A further object of this inventionis'to providean instrumentwhose novel arrangement, combination, and construction of parts make it possible to transmit minute draft impulses for the automatic regulation and control of combustion regulating appar'atus as is described in copendingapplication for Letters Patent, Serial No. 371,540,

filed April 5, 1920. I

.In' discussing-the principle of this invention, the need for such an instrument as is herein described, its application and limita- The principle is practically that of a delicate set of balances, or scales. By, the counterbalanced system of levers hereafter described, the'difierence in ,weight or pressure of the atmosphericor-outside air and the combustion chambersv as, whichn's communicated to the encl chamber of the draft gauge, is actually weighed. This difference in Weight is draft pressure and is indicated and recorded as hereafter described. Theprincipleof Weighing is iifffill'lplished by means of a Wcightof iii-zed value moving out froina vertical or neutral position thrmigh an are thus increasing the dis tance thc sine of the angle of are .subtend ed) through which it acts. p The draft pressure acting over an area in the enclosed chamber of the draft gauge is multiplied in force by just this area, which the movement of .Weight force causes through its arc by operating on the other side of the balanced center and is therefore proportionate exerted. I

The, need foran instrumentfof the char! acter in metallurgical and industrial op erations 1S recognizedwhen it is understood that in many metallurgical and industrial operations a very slight variation in draft pressure influen'ccsthe operationsto such an extent as to cause upsetting or unbalancing thereof with resultant ineilicientoperation. In such operations as these a dependable draft measuring instrument, indicating and recording extremely small draft pressure variations by a good liberal movemcntof the indicating. and recording units is essential to correctoperation.

An instrument of the character herein de- ,scribed performing its functions as herein stated fills this-nced'it isbelievcd, to better advantage than any instrument of its kind now on the market, by virtue of its ability to the counterbalancingforce" torccord extremely small draft variation of an inch Water, Withtheinstruments. re- 1 cording a range ofone-tenth draftwith onequarter of an inch movementof the recording oriindicating pen itis necessaryto sub 111111 )l1111de of the osoillnth'm's of 11111 11111 and sumo-1'- l pressures exerted 11111111 111 with pre 1 111 v: s o1 lhe well k 1 .11 011211115111 '16. -1 1 1 can he 11121110 as long: 11

pen 1 1e device 11111111 1'1 111 (l '11 11 g in H1 111111111111111011111211 111 11 111 111131110 fer-tor.

esenro, 0x11111151 if 11:11:1 of rho c motion. which 111111111 of and 111.111 is of 91111111111111 1 .1111: (,U1111111l11h't1l0S uted s as for 11151211160 11 1111 111 1 or such as :1 0101' 0 .1 o. 1. n1 1 ll u C1,.

source of (1111 11 11111.

111 dre 1'1 sired. 1

Q. 1 1 1 ml .111 inch 1 pro 11o ten d1- 111-111 .111 1111-11 water 1 of 1101' over :1

111g chart 111115 '1110 rev \Yhen 1111. [he

7 at small ehnnges in pressure 21nd nlforde 1111 :110111'1'119 measure of lhe 1111'111- Mons.

losed I80 isc aftpr ion therefore 11111111111 con- 11 pre :11- may be 1113 only on nt that the dev the [11 1! ll whh 11111111 (111 1'0 or normal 110F111 able even condition. Cally down 111'121110115 of (h wolght 152 The 111ore111e11t 10 both sides of the neutral \Yhilo we have disvloeed what we consider :11 he preeent 1111111 111 the inventlon, we

ways.

ln the fore has been shown.

It is also evide 1 ho ed 111 0 .11 111 11 11111111111 hv sorewin ole 1e surface of The 101 e 3 15 $11.

ght other forms 1n (101 1- exhen 111111111111 10 nel. 111

e threaded portion 10 0 arm 8 in the Well 1;

, 8 and carries 21 Wei together with :1 $11111 .1111 of 1151111 011 A draft p1pe- .1011 L 11110 the c in, 1.111310, wire or e lever 6 and in 1' .01s on [1113 $1110 0 1.. (:onnte Similarly to'weight- 9 in wei 1111i 1 DOWH 1115111118.

1d. The recent:

.n 11 extends downwardly from 1 f 1111; oelzrnce oe recenmolo 1111 (he rere 9 t) parts whose weight 9 or 12 adjustable thereon 11 lever 6 revolving 1 .1 01

ght- 9 over Another 2.1 .he lever system 6 pan-l senli :1 closed thron by means 0 center The pun suspended in the liquid from one arm of the balance, means acting upon the other arm of the balance in all an ular positions'thereof to counterbalance t e force acting upon the first arm at a definite pressure condition 7 within the vessel and a weighing arm connected to the balance at the fulcrum thereof,

having a downward vertical position at said pressure condition.

A draft gauge comprising a vessel containing a liquid, a balance, an inverted vessel suspended in the liquid, from one arm of the balance, an adjustable weight upon the other arm of the balance operative in all angular positions thereof to counterbalance the 7 force acting upon the first arm at a definite pressure condition within the vessel and a weighing arm connected to the balance at the fulcrum thereof, having a downward vertical position at said pressure condition.

3. A draft gauge comprisinga vessel con taining a liquid, a balance, an inverted vessel suspended in the liquid from one arm of the balance, an acqustable weight upon the other arm of the ba ance operative in all angular positions thereof to counterbalance the force acting upon the first arm at a definite pressure condition within the vessel and a weighing arm connected to the balance at the ful cruin-thereof, said weighmg arm having a downward vertical position at said pressure condition and carryingan ad uStable weight.-

4. pressure gauge, comprising a balance, pressure-responsive means adapted to exert- I a force under the influence of a pressure me- (hum, means for causing the said force to act upon one arm of the balance, means on the second arm operative in all angular positions of the balance to counterbalance the force acting uponthe first arm at a definite pressure of the pressure medium and means constructed and arranged to act'upon the balance with a force equal to zero at equilibrium and to progressively oppose movement of the balance from equilibrium.

In testimony whereof, we afiixour signatures.

.. LABAN ELLSXVORTH JONES. CHARLES ROSWVOLD VVRAITH. 

